/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.sea.ftp.command.impl.listing;

import java.util.Arrays;

import com.sea.ftp.ftplet.FtpFile;
import com.sea.ftp.util.DateUtils;

/**
 * <strong>Internal class, do not use directly.</strong>
 * 
 * Formats files according to the LIST specification
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class LISTFileFormater implements FileFormater {

	private final static char DELIM = ' ';

	private final static char[] NEWLINE = { '\r', '\n' };

	/**
	 * @see FileFormater#format(FtpFile)
	 */
	public String format(FtpFile file) {
		StringBuilder sb = new StringBuilder();
		sb.append(getPermission(file));
		sb.append(DELIM);
		sb.append(DELIM);
		sb.append(DELIM);
		sb.append(String.valueOf(file.getLinkCount()));
		sb.append(DELIM);
		sb.append(file.getOwnerName());
		sb.append(DELIM);
		sb.append(file.getGroupName());
		sb.append(DELIM);
		sb.append(getLength(file));
		sb.append(DELIM);
		sb.append(getLastModified(file));
		sb.append(DELIM);
		sb.append(file.getName());
		sb.append(NEWLINE);

		return sb.toString();
	}

	/**
	 * Get size
	 */
	private String getLength(FtpFile file) {
		String initStr = "            ";
		long sz = 0;
		if (file.isFile()) {
			sz = file.getSize();
		}
		String szStr = String.valueOf(sz);
		if (szStr.length() > initStr.length()) {
			return szStr;
		}
		return initStr.substring(0, initStr.length() - szStr.length()) + szStr;
	}

	/**
	 * Get last modified date string.
	 */
	private String getLastModified(FtpFile file) {
		return DateUtils.getUnixDate(file.getLastModified());
	}

	/**
	 * Get permission string.
	 */
	private char[] getPermission(FtpFile file) {
		char permission[] = new char[10];
		Arrays.fill(permission, '-');

		permission[0] = file.isDirectory() ? 'd' : '-';
		permission[1] = file.isReadable() ? 'r' : '-';
		permission[2] = file.isWritable() ? 'w' : '-';
		permission[3] = file.isDirectory() ? 'x' : '-';
		return permission;
	}

	/*
	 * public String format(FileObject[] files) { StringBuilder sb = new
	 * StringBuilder();
	 * 
	 * for (int i = 0; i < files.length; i++) { sb.append(format(files[i]));
	 * sb.append(NEWLINE); } return sb.toString(); }
	 */

}
